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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f460b6a8421b37775aa0094ac4cd4ed19f4e85f30c5bf25e4a625a9934beae' 
  AND token = 'lXwMF7vHwdRxWNbtOH8nfp6VRpy07H3mtGb+adEKxaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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