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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62062caed925e64a2fc75c1e2a594a64ed7b9962f0d9b5250bb79ac8ff2a7e8b' 
  AND token = 'mYGGfxUWH3dh8zbA/iMwHxJ9Rtusxbd/k1IiymV3G/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}