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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434c793d4ab710e3b5677aaab908fd5534663e0cf9149162646a0b895080d8d9' 
  AND token = 'AK7+S/e5ay9QZyLiEysyJ/CLLXWKnilt11P65DRe5BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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