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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94683d994c66b7c5d4b76ac2471e07d9a7e36a8ee6b5024a3cd0954ec4b07487' 
  AND token = '1C9XyNkIHtF/9/s4J7pwamid7wHpkg9sWttZHJyJVmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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