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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f56342c95973fe88e727b8caba7f69e5bb1b7490bd53cf58df9e2140fb14394' 
  AND token = 'qzrKnB59rN9d5v2esImS64db8v+llU02g6VjD/kzR3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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