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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d1cfb5d1310e5189c2a18043c4cbfd4eea42d4aa8f2c2e9f624e5d5855e002' 
  AND token = 'q/aTHSwgqkqhf62bk8+0JrMSMMHUsKRzIAOTQyAA2/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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