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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2431c2c9c99b819e989c961593675bde415a4b8119afb98767f40b70d0afeea5' 
  AND token = 'Y5Tc1L2JvioUxKbtjLfgl5ZP1lgxpYrdQL5i0TBgqiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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