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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30384142634cba696e2f4c5dff6f2fec7dfb1255cdd382f5f070e0eec99d75d7' 
  AND token = '1bemZ/2MVXIgbt0vftuseeAEknEcqg+BZ6SIPdNNM74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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