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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f12d25711cc5cf946406d618a277829cde73502e42471a7d14ce25286033920' 
  AND token = 'FC3PDcyUJKCTHDgb8w8xqpBh65fTNBTGC6Iot6X97Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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