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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fb9bb6705ed9e4414b26c2dd69ace75a361dc3ad157c80f65deb875edb28c4' 
  AND token = 'n/cXHT3lR7TInLjKRjcXTHdR63CNSrBTypTrPKrwz4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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