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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f7ed0c71ed1da87f0a23c3344bcd0cca62fe684bc487615aebe8fc94df4485' 
  AND token = 'cQLE+1FTJHk7OF4ts7cYupnaEdEtC6yIsfnPUZ9wirw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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