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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439eaa8b0a7697c66a7b4127d9124975584f5f6bb64811533c4661d422a02a5d' 
  AND token = 'ea3fghF0cqoduznPZhW9ON8m+bp6EvPnAASMfPR4HsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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