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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6662923193739b6d1cf79ad71808a753938f0aebf7493606f69f87e12e8895c9' 
  AND token = 'uKIgcQ4sKU+uHMSDe7iW/1dkLgrUB5c9/3ZQp9metPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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