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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b7cf467586b20ff8c8fb3149e29b4bbe701e6e32c51b5c5191178d61c91ae7' 
  AND token = 'hxvRDaxoRbch0heA4Y1sjJuAKv3RfFVpHRG4sAhz6No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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