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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5495e141e381bf5c77ba2db9ff880f4077bff72f0029a03cf8dd686fade905d2' 
  AND token = 'td1WX4+Nredscb7VGwKzdFteXRSqqtCNYO8l2GNXit8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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