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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd02cc2fbb2d918d5b63a0830f9e9312475d7feaf126b7f0b22c4418aba04cbe' 
  AND token = 'RWIuXoQY4ibsfO/Ft+6S+qG8jRx9YDEhKeMtFq7wzr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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