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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e24a7ba2e44e6de23db4da1941b675dfd74ceb448d6c579a893c4c68ce8ba0' 
  AND token = 'g8ZbB5byrEUzzEG9fDtAaeJA3edxN0ftbz2GJUOINPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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