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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5a88db91f7b56a87cc1af0f473f339d8e9851d9d5022ce0fb198e61dc508b2' 
  AND token = '71N09r/+iZwS4VY3xNVUXHUj3zVtxAVaDLUMcU7EGPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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