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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1196e5b6d80007ea861a966021052765b77d754e0986ba91e8dd2170567b6760' 
  AND token = '/iVs4n+/T1KGgAXAC7wn6np76/xtVgiR+sM0jXG5Xjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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