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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0686edaba45c573dfd7782b3d8fa00866a0e4b6d4c2cb48dd694a46136dddd8d' 
  AND token = 'amKvuudTsuJaquZeu1He8Lcez9e3uLCv0ZEMx0g1QO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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