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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab5b52ab53e95a97514fe36610ed563a5e602961f926ed889367d525564b1a7' 
  AND token = 'g27YEwDvrzwKSMtpwlsEFMG7RiIzbLhLXM/cH+V/E60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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