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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6023929cd6e662b7100861c37fb7225bf84dc9e975694dd60477c2c0b57c08' 
  AND token = 'sQ358o1+Ih/WdvhYXqFEmStQ+HoIRL5GIaDexxZ428w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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