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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d34c5aef0a29000b42f0d9683952859b67f5dc14d92e8c824a3538887cd6f9b' 
  AND token = 'bIdPfhrGrH61fTZtK6qMAX6Suo9il++XLdjC+BaSpqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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