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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ed994750d4239e753f00cad703a6e9b0c13ff8ce700dc86094ca3fd73690c3' 
  AND token = 'w/r+8ERy1TzVS/oxp/lfd3wFRhr9ruwg1iugafJjhMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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