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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35141e1fee1f4e91e644c34cc5028e66796be4764f5efd7e5102f3eedc38668' 
  AND token = 'phJegAxWv9uEN2kc66SS6BH4PcbWq6a+MnqeUpCEs2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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