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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195709095cb1114150a8cc0bab840d8b0ca3582cbed6324372916610c82fc106' 
  AND token = '+gZfQKZ1qOJmjba0mZzdeQ022N6kIYWy//njTKAxTCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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