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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d29399dcefdec7f7054388cca30faefce5db0f189e40596321148d8239e8fbd' 
  AND token = 'mAMO22aBAC89tDdgI4yV+LkVW6MGaqzq+40aVd9QYhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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