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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10f8c2b026b10bc54ea965409f7d0bc90ff4dec22097830ea8f2ad680ffb8a2' 
  AND token = 'PwjvzFVlvPlo/8cZKD557F2cvUE5XG24WFh1iAIE3UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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