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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b63c3f0d677bccd6cd0a42d630fb92f82bafe090842125cafd22065e92b104c' 
  AND token = '9cQNcTFMMk7sYicEaqwMiitxhqb4mHT/V2qFg93VwqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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