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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33b09317471673f0a725361f97a272bc14d636ac4528e21d7999792ab81d3b9' 
  AND token = 'Q4lfmf96CWfZcbFuBNPP3FSQy8folzbJ1FGan8c1TUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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