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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9559a8d8bf55686c64bcd4fb1018c332a00a19e28853975a9394714fba37c7c0' 
  AND token = 'hXHEOynWVmLD7Egadtf1mvtbScWFkNrCHgj9lBr8fZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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