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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e0debf8e3b49ee552588a2014d21b7892c16b2264fd7ec82dd6d00a096f0e8' 
  AND token = 'OY5gy4yXsxzG/EluJFldEpVcjXmjHd2G4BiiAmbFzPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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