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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115ae24e745388136695fcacc794d0f931bc37f96387984014ced5d51f13545e' 
  AND token = 'N8XIO8EWwKLNbyv/nJj5O/LQ5DOucHbEsFBpK3OoH8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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