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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c90436699c60ce738785457e36aaab02c8c7f51683c93d1da492449ad8f9f7a' 
  AND token = '5X8stqn9WZPbWA7Ve5JBuw4rIDArSCvUUssrapGDnCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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