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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7394cebae5986fd74be7dc90d0d19061cc7c1ed54901abdfde61877773e8964' 
  AND token = 'gNADrAarpzWSzCpkjkT6l0+ZyA2Ar0HF8fRaKYEjDsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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