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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a91305278f844f1b6902485d9a6e61e591ba0cfd51c09e36bbfa3fb9a5d624' 
  AND token = '6pDT2oOFQ0DKtw8ZXpBoPH0f9ecGN6JfkDFVS19py7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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