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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1d8df056df27f78d6cb4e704255516d303e2e609f25406cecc7deccb026680' 
  AND token = '7F8x+A/ONoSaiYHmDcTgYmKMQgodgrUeyh8cTY2QmPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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