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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f7f363a9d048cd31d6a37aa64ede6a4471d0dfa54054aaf96847d8bd26eddf' 
  AND token = '17Lp4kPBtFPO/bEF4oX7aaZ2GNHgF1EQvaJlAVEw72Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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