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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5309b95d8725ce6a09a191bb6ff6d77d79df23502843b9e507f6e0a3f5dacb' 
  AND token = 'sQVHJs0lU0Mi8UptqGOb6GlfYzzcXTo5ezIOAl2iqgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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