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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc3a4c4136a5a4d039e6536fa2631e212eafe733eeecf26ff6195126911b80c' 
  AND token = 'tuDeoWs593XglliKgt6jD1gWLcV2hFdvK41d8T2R/vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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