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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e74a0d8a9108b86a0a0dff8abcab60ae471ceb1b8f98c63133f4817119c3236' 
  AND token = 'oMXotDWPRPv/Qv2EgNwjwfq3qYXxxjzNRvKrYWgjI0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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