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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579553142ae14cf19f11847522986841e923847610b87e01556dfa5d9ed13349' 
  AND token = 'KZlfNO3PCgMBUHaOoheWzhy2W2Nf3i1QId199K8G1KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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