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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36776661fc61587a41acf050580f9cfffdfa3c2b762fcf48bcf2d7f1f25a1b4' 
  AND token = 'XVxuPxLWZ9BhRXSh4TlyqROllIF4vcZmLFFBHIR7Um0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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