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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e8cbb2354124cc0f5529df27af16237de49760b7bd89b47cf0565765cffe76' 
  AND token = 'B/G0D7ngd0zL6TYN50HtTW4D0RtPrKkM5E8W++uO6u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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