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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4bf41fb9611657676f20c9caf0b9f1bc7e4116ee519e71278d9bb18a0bf30cd' 
  AND token = 'rAlZkyVkxCOWdB4aBzlVJKeugowpteiCuhh7JBy8DyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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