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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b1e740f8bc26aeef77ad16c7f20ca95d270395d8a4bf755b0cc8f996fd6d27' 
  AND token = 'Ob9MwwjiMlkc0G2IontmHyeFAle/QfF7P0tOJzA8bog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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