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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabe8a367d401eab6e45c91a78b713f50fae8ae58b08df1e6b27fcc56aabe00f' 
  AND token = 'TDt3y1EZUS9S7q56+Rw+2z32rk5rO8nMP7dyikuVhgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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