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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b433ba702a300e1da7c93220d68defac0b2605afd7ac640c5166d6f624d6bf44' 
  AND token = 'xxejMIfL9Lf+qW/e6upfqRC6Jgs6BwSYPR6QcFVZtP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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