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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5883cfb22e75d7965da987ba32ed67227d7142199fd107315108bd042902375c' 
  AND token = 'z7UYkX/YxCV4lr7/yt4Qs9Nw4oQ4e373EuJ7isgpNwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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