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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0694b0c53d949cbd7f4aed94ad7a420bd0de7e92f23f370561e5384d6958c6' 
  AND token = 'kbAgY2RHfPoVO1jQgjMzgVHRxGk17iMYLzHm8ER8LYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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