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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b4d57a4292d3a26771bcb1f3cb693e4287b50e5d624f04882b7908d0773988' 
  AND token = 'sOgDcSgUkRKXpXQK04eQlQYdvONzZCOYm8f3EK+kg3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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