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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0325dfc9646eaab6048c9dbd89314b575e752c7182aa290f11ee2b420719e24e' 
  AND token = 'KEILYg2joft/18kp5oyH7y8uh5/8mbXz/qcD6PJVuYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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