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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4fb95df9d95fd1008e0af2ec65a5748d87dfb8c9709d169627f4c7fba18d40' 
  AND token = 'K9FzCVTgS5AqeTZvvHh5VC9EMMekVmT+gXcvX2rjBoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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