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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3ca843ad9e92fcaf7def447c8fd34e3997079cf00032dad3e3e81d585d8dc6' 
  AND token = '0F36hdZ8W1uKdam322jh0X3PYTtufN/Pz7jLp4+z4TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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