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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf6457e50973d97c00e5e757b12a9a1f89a9cf841d6eaf93c95650ef288d5ca' 
  AND token = '4gLNwxaQxWhfi8Bsk4HJXRz+DIkE4seT/mxSQiCM+yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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