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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f987f3bb777f0d4b89bef8932e943eaadfa3631231728491bc31ea2fe0da7f8' 
  AND token = 'l3dIA9+nm4EcmiUKYQVfg8QSGEFkuvltTmmBLw5PGj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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