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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a907c2e4e0102e59d4ef266ee653636b54736afcfeb3529d0c0143356ed4ca2a' 
  AND token = 'x7ZnKj5wcVRmPXnC50VQrPjmOmwqeK97w/7bzabzd1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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