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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7c400faf047b5b76a7562bd5caa4aa5bb0d1fdbaca516040b15b0ef9fdc892' 
  AND token = 'qGj6NAkOjoDKFM4rElHsMj9sqY3Z4o97QWlhidc0+wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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