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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c39b03202f61730cf6f79d49d9732d3ec2a09fb41b2964bfd07e0abe1c72e2' 
  AND token = 'rHZ6yN9mZSWup5LHIxzTGsPpx1+UhysXZa98rCplnP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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