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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4f21836c74a69dbe5152496223023d6b908b76fc4d4f90b0bb5cd55a9efdeb' 
  AND token = 'NMVKLfk9Dbwhl/Qju8elpm5Rvu9ueu9A2I68OZol1Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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