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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e444c0f7427d3902dbee8d58ca27b3ee07babf82880c79404da9f8b6b805d7d' 
  AND token = 'rp7XE3JkTZ9udka+/OKREFV23XUs4PkTmDkA7ttOiVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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